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4 cinema F-20's

post #1 of 661
Thread Starter 
Hey guys,

I wanted to try something new and go DIY again. This sealed chamber horn that Lilmike designed had me interested so I ordered 4 MFW-15's. I also did not have much time to completely build these so I had eD CNC a flat pack for me. I had them groove in the Auraco Plywood like the DTS-10 kit so the panels would easily line up and take out the guess work. Well, I have even less time(Wife just had my first son!!!!) so I had eD just build the whole thing for me. They also said that the wood is not good enough for the grooves so if anyone wants to do this I would choose Baltic Birch. eD filled in all the grooves and the subs came out very nice and solid! All I had to do was screw in the driver, connect the wire, and then screw in the access panel. Here are some pics of eD building these.

































Here are some pics of my new room and the subs in their place. I have 3 M&K S-5000's on old bass bins as well. The red corners are bass traps and the back is a gold bass trap. The room is not completely finished so I will take more pics.







Here is my first raw measurement with no EQ or smoothing.



I started to watch Tron and the wife came down and complained so I have not had enough time to dial these in and take more measurements. I want to keep raising the sweep to see what happens with compression and also run THD and SPL graphs.
post #2 of 661
how much those set you back?
did they end up with baltic birch or arauco?
post #3 of 661
I must have missed it. Are your mains sitting on midbasses?
post #4 of 661
Thread Starter 
Quote:
Originally Posted by ufokillerz View Post

how much those set you back?
did they end up with baltic birch or arauco?

They are Arauco, if I used an expensive driver I would have went Baltic. Once I get rid of the in laws I will crank them up and see what they can do. Should be later or tomorrow. These only cost about $250 each to build if you DIY.
post #5 of 661
Yay! New MKtheater thread.

Even got a complaint from your wife. That definitely means something.

Epic thread begins epic.

Subscribed.
post #6 of 661
Thread Starter 
Quote:
Originally Posted by Looneybomber View Post

I must have missed it. Are your mains sitting on midbasses?

Yes, no driver though. I am thinking about maybe putting one in there. I have 4 JBL 2225's sitting here. I would have to add external XO and such though and right now it is very simple and easy.
post #7 of 661
long awaited, but well worth it!!!! cant wait to hear your REAL impressions
post #8 of 661
Thread Starter 
I will be trying out some BFM DR-200's to compete against the M&K's. These M&K's keep up with the subs with no probelms. The graph was subs only with a 80hz XO. I have a new processor coming as well to try different XO points. I have an Ada Suite 7.1HD on order.
post #9 of 661
MK,

I wanted to say congratulations on the most important part of your thread and that is your new son. Congratulations!

James
post #10 of 661
Thread Starter 
Quote:
Originally Posted by exojam View Post

MK,

I wanted to say congratulations on the most important part of your thread and that is your new son. Congratulations!

James

Thank you!! He sure is keeping things in perspective. I would of had 15 graphs done by now with numerous movie testing but as of now I ran this graph and watched the beginning of Tron up until Sam rides his bike. The music is very powerful and during this brief audition the F-20's were great. They put out lots of bass with very little power, I mean little, impressive indeed. Of course I am curious as to what the graph will look like when I run a 120 db sweep. I am guessing the 10hz and under will be long gone but maybe it will still be loud enough. We shall see.
post #11 of 661
Congrats James!!!! We are in the process of a kinship adoption of our niece (she's 8 weeks old). It will make 7.
I just can't get over not seeing big ass JBL's in the front .
post #12 of 661
Thread Starter 
Quote:
Originally Posted by Wrager View Post

Congrats James!!!! We are in the process of a kinship adoption of our niece (she's 8 weeks old). It will make 7.
I just can't get over not seeing big ass JBL's in the front .

I know, I am testing these speakers again. They play really loud and clear but need a tad more midbass. I am not done tweaking yet. I have an AVS member waiting for his Ashly amp that I have to get to first thing when I get home so everything needs to wait. He has waited for a while and been really patient.
post #13 of 661
Quote:
Originally Posted by MKtheater View Post

t out lots of bass with very little power, I mean little, impressive indeed. Of course I am curious as to what the graph will look like when I run a 120 db sweep. I am guessing the 10hz and under will be long gone but maybe it will still be loud enough. We shall see.

I'm surprised to see them go that low, I thought they were designed so that the freq response fell off a cliff below 20 Hz.
post #14 of 661
Quote:
Originally Posted by Raul GS View Post

I'm surprised to see them go that low, I thought they were designed so that the freq response fell off a cliff below 20 Hz.

You forget the 'bass cave' MK has.....the room gain he gets is impressive.

Subscribed.

JSS
post #15 of 661
Quote:
Originally Posted by MKtheater View Post

I know, I am testing these speakers again. They play really loud and clear but need a tad more midbass. I am not done tweaking yet. I have an AVS member waiting for his Ashly amp that I have to get to first thing when I get home so everything needs to wait. He has waited for a while and been really patient.

That's cool! We've all benefitted from your trials and tribulations. I wouldn't have the 4622's if it weren't for you and the 3622's.
post #16 of 661
Thread Starter 
Quote:
Originally Posted by Raul GS View Post

I'm surprised to see them go that low, I thought they were designed so that the freq response fell off a cliff below 20 Hz.

This is a low level sweep and they act like a sealed sub below the knee. The 4 MFW-15's can extend low at low levels but I expect them to compress when turned up.
post #17 of 661
how long did it take between them taking the order, payment and shipping?
post #18 of 661
Thread Starter 
Quote:
Originally Posted by ufokillerz View Post

how long did it take between them taking the order, payment and shipping?

About a month but mine was long due to being the first trial.
post #19 of 661
delete
post #20 of 661
Looks great MK, I'm sure they sound incredible. I've no doubt you have the most 20Hz performance you've ever had in that room. Below that I don't think they're hanging with the DTS-10s or sealed units of course, but I'd love to see in-room THD for the lower stuff just to see what your healthy room is doing for these.
post #21 of 661
Congrats on your son MK!
Glad to see that no matter how many over-the-top setups you do, you never get comfy and leave it alone. I LOVE that!
post #22 of 661
Thread Starter 
Quote:
Originally Posted by BiGBADDABOOM View Post

Looks great MK, I'm sure they sound incredible. I've no doubt you have the most 20Hz performance you've ever had in that room. Below that I don't think they're hanging with the DTS-10s or sealed units of course, but I'd love to see in-room THD for the lower stuff just to see what your healthy room is doing for these.

I agree with you but my goal here is not to be flat to 10hz, it is to have enough 10hz-18hz to feel while the 20hz and up is first class. I will measure them with THD.
post #23 of 661
Quote:
Originally Posted by MKtheater View Post

They are Arauco, if I used an expensive driver I would have went Baltic. Once I get rid of the in laws I will crank them up and see what they can do. Should be later or tomorrow. These only cost about $250 each to build if you DIY.

BTW... time to get used to lots of down time and the excitement of "mommy and baby are going to be gone for a little bit! Time to squeeze in some theater time!"
post #24 of 661
Thread Starter 
Quote:
Originally Posted by kryptonitewhite View Post

Congrats on your son MK!
Glad to see that no matter how many over-the-top setups you do, you never get comfy and leave it alone. I LOVE that!

Thanks, I really love trying different designs to hear what the true in room differences are. I think it gives me a wealth of experience and learn from my many mistakes.
post #25 of 661
Thread Starter 
Quote:
Originally Posted by kryptonitewhite View Post

BTW... time to get used to lots of down time and the excitement of "mommy and baby are going to be gone for a little bit! Time to squeeze in some theater time!"

Why I want to complete this ASAP.
post #26 of 661
Quote:
Originally Posted by MKtheater View Post

I agree with you but my goal here is not to be flat to 10hz, it is to have enough 10hz-18hz to feel while the 20hz and up is first class. I will measure them with THD.

I hear ya, considering you're probably pushing 130dBs at 20Hz at least, I think your goal is pretty well in sight.
post #27 of 661
Quote:
Originally Posted by MKtheater View Post

Why I want to complete this ASAP.

Every time I say that, Brandy gets pissy real fast. She knows that a "quick 2 minutes help me calibrate" turns into an hour and 1/2 later just 2 more sweeps, I promise.

It seems like you ned to do something for your 20Hz on up and something else for your 20Hz down. The 8 sealed 18's seemed like you were happy, I am not sure... that was before I became a regular here. The DTS-10s it seemed like you were mostly happy but missed the single digit ULF a little? Maybe these things here combined with something else for the 3Hz-19Hz?
post #28 of 661
Thread Starter 
Quote:
Originally Posted by BiGBADDABOOM View Post

I hear ya, considering you're probably pushing 130dBs at 20Hz at least, I think your goal is pretty well in sight.

Yeah, from my brief demo I know these have serious output within the horn. You know something is powerful when it puts a smile on your friends face even after being used to 8 18's. The real test will be coming!!
post #29 of 661
Thread Starter 
Quote:
Originally Posted by kryptonitewhite View Post

Every time I say that, Brandy gets pissy real fast. She knows that a "quick 2 minutes help me calibrate" turns into an hour and 1/2 later just 2 more sweeps, I promise.

It seems like you ned to do something for your 20Hz on up and something else for your 20Hz down. The 8 sealed 18's seemed like you were happy, I am not sure... that was before I became a regular here. The DTS-10s it seemed like you were mostly happy but missed the single digit ULF a little? Maybe these things here combined with something else for the 3Hz-19Hz?

I am not sure what I want but a RE-XXX 18 IB has been on my mind as well. I want to see where these take me as the look is just damn cool with that giant horn mouth. No drivers seen.
post #30 of 661
Congrats! Those F-20's do look menacing. But the looks dept goes to the JBL's.

James, correct me if I'm wrong. Your room is slab with 3 concrete walls, no HVAC, no vents? Are all the walls, ceiling sound treated? Is it drop ceiling or sheetrock?
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